/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.dolphinscheduler.service.utils;

import org.apache.dolphinscheduler.common.constants.Constants;
import org.apache.dolphinscheduler.common.constants.DateConstants;
import org.apache.dolphinscheduler.common.utils.DateUtils;
import org.apache.dolphinscheduler.plugin.task.api.TaskExecutionContext;
import org.apache.dolphinscheduler.service.log.TaskLogDiscriminator;

import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Date;
import java.util.Optional;

import org.slf4j.LoggerFactory;

import ch.qos.logback.classic.sift.SiftingAppender;
import ch.qos.logback.classic.spi.ILoggingEvent;
import ch.qos.logback.core.spi.AppenderAttachable;

public class LogUtils {

  public static final String LOG_TAILFIX = ".log";

  private LogUtils() throws IllegalStateException {
    throw new IllegalStateException("Utility class");
  }

  /**
   * get task log path
   */
  public static String getTaskLogPath(Date firstSubmitTime, Long processDefineCode, int processDefineVersion,
                                      int processInstanceId, int taskInstanceId) {
    // format /logs/YYYYMMDD/defintion-code_defintion_version-processInstanceId-taskInstanceId.log
    final String taskLogFileName = new StringBuilder(String.valueOf(processDefineCode))
        .append(Constants.UNDERLINE)
        .append(processDefineVersion)
        .append(Constants.SUBTRACT_CHAR)
        .append(processInstanceId)
        .append(Constants.SUBTRACT_CHAR)
        .append(taskInstanceId)
        .append(LOG_TAILFIX)
        .toString();
    // Optional.map will be skipped if null
    return Optional.of(LoggerFactory.getILoggerFactory())
        .map(e -> (AppenderAttachable<ILoggingEvent>) (e.getLogger("ROOT")))
        .map(e -> (SiftingAppender) (e.getAppender("TASKLOGFILE")))
        .map(e -> ((TaskLogDiscriminator) (e.getDiscriminator())))
        .map(TaskLogDiscriminator::getLogBase)
        .map(e -> Paths.get(e)
            .toAbsolutePath()
            .resolve(DateUtils.format(firstSubmitTime, DateConstants.YYYYMMDD, null))
            .resolve(taskLogFileName))
        .map(Path::toString)
        .orElse("");
  }

  /**
   * get task log path by TaskExecutionContext
   */
  public static String getTaskLogPath(TaskExecutionContext taskExecutionContext) {
    return getTaskLogPath(taskExecutionContext.getFirstSubmitTime(), taskExecutionContext.getProcessDefineCode(),
        taskExecutionContext.getProcessDefineVersion(),
        taskExecutionContext.getProcessInstanceId(),
        taskExecutionContext.getTaskInstanceId());
  }

}
